Manufacture of chain-swivels.



G. BISGHOPF.

MANUFACTURE OF CHAIN SWIVELS.

APPLICATION IILED MAY 9, 1913.

1,073,841. Patented Sept. 23, 1913.

My! my; my:

COLUMBIA PLANOORAPH CO. WAsMINaTq C,

UNITED STATES PATENT OFFICE.

GOTTHILF BISCHOFF, OF FREUDENSTADT, GERMANY, ASSIGNOR TO FIRM OF ERNSTG-IDEON BEK, G. M. B. 1-1., OF PFORZI-IEIM, GERMANY.

MANUFACTURE OF CHAIN-SWIVELS.

Specification of Letters Patent.

Original application filed February 24, 1913, Serial No. 750,355.

Patented Sept. 23, 1913.

Divided and this application filed. May 8,

1913. Serial No. 766,270.

To all whom it may concern:

Be it known that I, GOTTHILF BISOHOFF, a subject of the German Emperor,residing at Freudenstadt, Germany, have invented certain new and usefulImprovements in the Manufacture of Chain-Swivels, of which the followingis a specification.

This application is divisional of my copending application, Serial No.750,355, filed February 24, 1913.

The present invention has reference to improvements in the manufactureof chain swivels, also called snap or carbine hooks, and it relates moreparticularly to the manufacture of swivels of this character to be usedmainly in connection with watch chains, and the object of the inventionis to simplify and cheapen the manufacture of such swivels by assemblingthe specially shaped and worked parts without soldering, pinning orriveting, simply by pressing or swaging.

In order to make the invention more readily understood, I will describeit now with reference to the accompanying drawings, in which- Figures1-7 show side and front elevations, plan views and cross-sectionsrespectively of the swivel parts in various stages of manufacture; Fig.8 represents a side elevation of a swivel hook made up of these parts,the socket or neck being shown in section.

According to this invention there is first stamped out a blank,comprising a shank a with a plate at, having a slot 79, at the one end,and a reduction 0, oppositely disposed lugs 0 and a tongue (Z at theother end, as shown in Figs. 1, 1 and 2. This blank is then worked insuitable manner so that it assumes the formation shown in Figs. 3, 3' 4,with the trunnions 0 extending from either face of the plate 0, and thetongue cl slightly curved. The upper plate a is rounded, and a shoulderg and a crossgroove 1' are presented (Fig. 4). The plate a is turnedover rectangularly (Figs. 5 and 5) and the yoke or horseshoe is formed,as shown in Fig. 6, by bending the shank a, the plate 0 entering theslot p and the trunnions 0 taking into the respective groove-halves 1.To the thus formed carbine proper (Fig. 7) is now attached the neck orsocket 70 (Fig. 7") by the cup-shaped end of the latter being closedover the plate a in contact with the shoulder g, a spring at cooperatingwith the depending tongue 6!, as shown in Fig. 8; and lastly, the swivelring or eye 2' is secured to the socket by compressing the latter aboutthe ball'trunnion Z, h. If not previously done, the yoke a is nowslantingly severed, as at a (Fig. 8), which leaves the member 9 pivotedon the trunnions 0.

What I claim is 1. The method of making chain swivels, which comprisesstamping and pressing a blank in the form of a shank with a slotted andcross-grooved plate at the one end and with a plate having laterallyprojecting trun' nions and a depending tongue at the other end, bendingthe said slotted plate angularly to said shank, and then bending thelatter into horseshoe-shape until the said second plate takes into theslot of the said first plate and the trunnions engage in thecross-grooves thereof.

2. The method of making chain swivels, which comprises stamping andpressing a blank in the form of a shank with a slotted and cross'groovedplate at the one end and with a plate having laterally projectingtrunnions and a depending tongue at the other end, bending the saidslotted plate angularly to said shank, then bending the latter intohorseshoe-shape until the said second plate takes into the slot of saidfirst plate and the trunnions engage in the crossgrooves thereof, thencutting the horseshoe, introducing a spring into the swivel socket, andfinally, attaching the latter to the carbine proper and the swivel eyeby swaging or pressing, said spring being placed in cooperation withsaid depending swivel tongue.

In testimony whereof I affix my signature in presence of two witnesses.

GOTTHILF BISCHOFF.

Witnesses:

ERNEST ENTENMANN, FRIDA KLAIBER.

Copies 0! this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

